Add IPlayerGigProgressionStore (in-memory + Postgres V007), GET
/gig-progression snapshot, and CombatDefeatGigXpGrant on cast accept
when targetDefeated — 25 XP to breach, outside E2.M2 skill XP.
Includes tests, Bruno, README, manual QA, and plan reconciliation.
Documents E5M1-10 scope: breach main gig, 25 XP per targetDefeated,
GET gig-progression snapshot, Postgres+in-memory store, and cast hook
after NEO-82 combat resolution — outside E2.M2 skill XP.